OHM's LAW

[positive logic]

What if the resistance is zero? How much would the currnt?

V=IR

 

[Styx]

the only way would ocure is at absolute zero.

but saying that you would get infinite current - no power loss

 

[chemelec]

Absolute Zero, Not very Likely.

 

[mstechca]

if the resistance is 0, chances are you will have a blown-up circuit or battery, depending on the circuit.

 

[suicidalmonkey]

This concept (no resistance) is one of much scientific research. Scientists are trying to develop a super-conductor, a conductor with no resistane. These super-conductors were once only possible at absolute zero (-273C), as mentioned by Styx. However super-conductors are being developed that operate at temperatures higher than this.

As for the original question, well I really don't know. If the resistance is 0 ohms, then the voltage would also be 0 volts and the current could be anything upto infinite.

 

[Phasor]

The current would be limited by the internal impedance of the source. As yet, I am unaware of any source which has zero internal resistance. In such a case, all power loss would be within the source.

 

[Styx]

True teh internal impedance will ultimately limit the current.

However, lets assume we have a voltage source with no ESR and is shorted out by a wire with zero impedance, the only things that will limit the current will be a couple of physical effects

1) charge generation. In a battery an electrical current is generated via a chemical reaction to release ions, this reaction will take time to release a charged partical. Since I=Qt there is a finite rate at which charge can be developed then there will be a finite current (be it extrealy high)

2) physical size of electrons. Electrons have a fixed size and lets say it there was a hollow tube and we passes a gas of just electrons down (could be a good way to transmit current...) this tube there is a finite number that can fit into a cross-section, thus there is a finite limit on the amount of current that can be passed down a tube.
Now replace that tube by a metal conductor (and thus there aer protons and neutrons takeing up space) the limit at which you can push electrons thorugh is also reduced (not to mention effects do to attraction that will also limit the flow of electrons)